Pivoted bolt lock



Aug. 11, 1942. w. E. HAMILTON 9 I PIVOTED BbLT rjocx Filed Oct. 18, v1940 Patented Aug. 11, 1942 PIVOTED BOLT LOCK William E. Hamilton,Evanston, IlL, assignor to Dudley Lock Corporation, Chicago, 111., acorporation of Illinois Application October 18, 1940, Serial No. 361,6934 Claims. (01. 70-314) This invention relates to a lock of the typewhich is operable either by a permutation mechanism or by a key.

One object of the invention is to provide a relatively simplifiedconstruction for the control of a bolt of the pivoted type.

Another object is to provide flexible means operated automatically bythe bolt for shifting at least one of the permutation tumblers out ofregistered position after the tumblers have been set to release thebolt, and the bolt has been moved toward unlocking position.

A further object is to provide a sturdy and reliable construction havinga minimum of operating parts which shall be economical to manufactureand which shall be reliable in operation.

It is also an object of the invention to provide extremely simple meansfor releasing the bolt through the agency of a key and independently ofthe permutation mechanism.

Other objects and advantages will appear as the description proceeds.The invention consists of certain features and elements of constructionin combination, as herein shown and described and as indicated by theclaims.

In the drawing:

Figure 1 is a front elevation of a lock embodying this invention,including a fragment of a door or other closure to which it is applied.

Figure 2 is a front elevation of the interior mechanism controlling thebolt, the cover of the enclosing case being broken away to revealdetails of construction.

Figure 3 is a View similar to Figure 2 but with the entire cover plateremoved, and with certain parts of the mechanism omitted, thepermutation mechanism being shown adjusted in position to release thebolt.

Figure 4 is a view similar to Figure 3 but with all except one tumbleromitted and showing the bolt acting to turn the tumbler out of adjustedposition in its unlocking movement.

Figure 5 is a front elevation looking into the case with the permutationmechanism and its supporting partition plate removed to reveal thekey-actuated cam which operates the lock.

Figure 6 is a perspective view of the latch member.

Figure 7 is a detail section taken as indicated at line 1-7 on Figure 2.

A look of the type to which this invention relates is frequently used onclosures such as cabinet or locker doors, and it may be understood thatFigure 1 shows at A a fragment of such a door. These structures arecommonly fitted with vertically movable locking bars, one of which isindicated at B, and which may be understood as having a notch orabutment shoulder at C which engages the under surface of the bolt I.When the bolt is locked it prevents upward movement of the bar B, whichwould be necessary to release it, or parts connected to it, fromkeepers, not shown, but when the bolt l is unlocked the bar B ismanually shifted by means of a suitable handle, and thus permits thedoor to be swung open. In devices of this type there is a detent deviceserving to hold the bar B in un locking position and to automaticallyrelease it when the door is closed. An example of such a structure isshown in Patent No. 1,387,643, to Erickson et a1.

Figure 1 shows the case 2 for the lock mechanism in dotted outline asapplied to the rear face of the door A, and shows in full lines anescutcheon plate 3 secured to the outer or front face of the door with arotatable dial 4 and its knob 5 journaled for rotation in the escutcheonplate 3. At the center of the knob 5 there is presented the key slot 6for operating a lock of the pin tumbler type which is housed in the knoband which may be constructed substantially as shown in my co-pendingapplication Serial No. 356,489, filed September 12, 1940, which hasbecome Patent No. 2,244,152, dated June 3, 1941. For present purposes itis sufiicient to state that the knob 5 isinterlocked with thepermutation mechanism by means of lugs 5 (Fig. 2) intermembering withthe arcuate notches in the hub portion 1 of a driving disk 1, and thatthe key-operated mechanism includes a centrally disposed spindleprojecting from the rear of the knob assembly for interconnection withthe flattened portion 8 of the shaft 8, disposed coaxially with respectto the disk 1. In fact, the disk 1 is journaled on the outside of ahollow post 9, upstanding rigidly from the partition plate l0 within thecasing 2, and the shaft 8 is journaled within this hollow post.

The bolt I is fulcrumed on a pivot post H and provided with a spring I 2which holds the bolt yieldingly at locking position. It may beunderstood that the portion of the bolt engaging the pivot H isbifurcated to provide space accommodating the coiled portion ofthespring l2. One end of the spring bears against a wall of the casing 2,while the other end l2 lies in a notch l formed in the bolt adjacent itsbifurcated end. Above its locking nose, which normally extends through aslot 2 in the casing, the bolt includes a curved portion 13 whichterfrequently member Hi to swing -2 minates in a shoulder 14, and saidshoulder normally engages a stop [5 formed as a cross-bar in a latchmember l6 shown as pivotally mounted on the screw l1 which may be one ofthose serving to hold the case and its cover 2 together. A fragment ofthis cover plate 2 is shown at the opposite corner of the casing 2 inFigure 2. The latch member 16 is provided with a spring l8 which holdsit yieldingly in the position shown in Figure 2, with the stop portion15 blocking movement of the bolt by engaging its shoulder l4.

Th permutation disk tumblers are mounted for rotation about the hollowpost'9, being spaced from each other by means of washers I9, and havinginterconnecting lugs 23 by which motion is communicated from one tumblerto the next when they are adjusted in accordance with the combination ofthe lock. The uppermost tumbler of the series is shown in Figure 3 at2!,

having'a pair of upstanding lugs 22- to engage I in anydiametrically'opposite pair of holes 1* in the driving disk "I.-As"already mentioned the 'disk'is interlocked'withthe knob -5 forrotation thereby so that the tumbler-disks may be rotatively adjusted asdesired. Ordinarily, there are three disks, and the-two'upperdisks areformed with notches like that seen-at 23 in Figure 3, whilethe last orbottom disk 24 has a notch 25, as'seen in Figure l. A pawl 25 is carriedon a pivot '21 with one arm 28 extending adjacent the tumbler disks, andwith the upturned end portion 29 of the arm normally bearing against thecircular peripheries of said disks. But when the disk notches areadjusted in alignment at the position shown in Figure 3 this end portion'29 of the armZB enters 'the'notches'under the force of a spring 36, andthe other arm 3| of the pawl28 engages an extension 32 of the latch thelatch from its locking position shown in Figure 2 to its releaseposition shown in Figure 3, so that the bolt I may be swungrupwardlyabout its pivot Hby'actuation of'the bar 13 or any other-suitablemechanism pro- 7 vided for the purpose.

In its initial movement toward unlocking position the bolt shifts its"curved portion l3 past and under the stop portion I5 of thelatch'member, thus holding the latch member in open position inopposition to the pressure of its spring I8. As the opening movementofthe'bOlt progre'sses' aspring arm 33, extending from the inner'fa'ce'of'the bolt, engages an'abutment shoulder 34 formed in theperiphery ofthe disk tumbler 24, so that the swinging'movement of the bolt operatesto rotate the tumbl-eraway from its former position inwhich its notch 25was 'aligned'with' the notches of the other tumblers. This rotation ofthe tumbler 24' causes the'side 25 of the notch 25 to bear forciblyagainst the upstanding end portion 29 of the pawl 28, and to act as acam to force said portion of the pawl outv of the tumbler notches in themanner indicated in Figure 4, so that when the bolt 1 arrives at fullopen position, as shown'in dotted lines'in Figure 4, the tumbler 24 willhave been rotated by a substantial amount, carrying its notch 25entirely out of registration with the notches of the other tumblers andbringing a circular'portion 24 of its periphery into position to engagethe edge of the part 29 and prevent its return to release position. Thusthe other arm 3| of the pawl 26 is swung away from the extension 32 ofthe latchmember I6 so that as soon as the an opening Ill :lug'43 carriedby 26 and positionedin'the plane of-the cam plate fulcrum pivot I i.

'inets or lockers locking position the latch [6, under pressure of itsspring l8, will be swung back to locking position with the stop portion15 engaging the shoulder M of the bolt, substantially as seen in Figure2.

The arm 33 is preferably made of a strip of fiat spring stock, such asclock spring material, and is firmly rooted in the body of the bolt I,being retained by a pin 35. As seen in Figures 2 and 3, it is formedwith an initial curvature, and, being flexible, it is adapted to be bentfurther if the movement of the bolt toward its unlocking position shouldtend to rotate the tumbler 24 fas ter than the part 29 can be cammedoutof the notch]?! by this movement; in other words, the flexibility ofthe arm 33 compensates for any slight discrepancy in these relatedmovements, and insures easy action of the parts without permitting themto bind, as they might do if there were no yielding element included.

For --actuating the bolt 1 independently of-the permutation'diskstheshaft or spindle 8 carries fixed near its lower end a cam plate 40, thisplatebeing mounted on the shaft 8 between the back wall 2 and the'partition plate 10. The partition plate ID is formed with spacing lugs,shown in dotted-outlineat 10 in Figure 4, providing comfortableaccommodation for movement of the plate 40, and the partition'isconveniently 'held'in this position by means of coiled springs llcarried on the securing screwsAZ which-extend through the cover plate 2*and engage threaded holes in the back wall "2. Figure 5 shows a fragmentof the partition plate 10 with cut therein'to accommodate a theextension 32 of the'latch 48 for contact with its curved edge M. Thus,when the proper key 'isinserted in the *key slot 6, so as to turnthe-shaft;8 from the position shown in dottedioutline in Figure 5 to theposition shown in-full lines, the'cam 40 is likewise swung from itsdotted line position to full line position so as to rock-the-latchmember l6 to release position, swinging its stop 15 out *of engagementwith the shoulder M of the bolt and permitting the bolt to be swungaboutits own Thus, by means'of the key, it is possible 'tooperate the lockindependently of the tumbler disks and without any knowledge ofthe-combination at which they must be adjusted to release the bolt. Thisis frequently useful in schools or other institutions where it'is'desirable that some supervising ofiicer, such as the principal,shall have access to all the cabby means of a master key,-and withouthaving to consult any record of the various combinations of theindividual locks by which they are ordinarily operated by theindividualusers of the lockers.

While there is shown and described herein certain specific s'ti uctureembodying the invention,

it will-be manifest to those skilled in the'art thatvarious'mo'dificatio'ns and rearrangements of the parts may be madewithout departing from the spirit and scope of the invention, and thatthe same is not'limited'to the particular form herein shown anddescribed, except in so far as indicated by the appended claims.

I claim as my invention:

-1. In apermutation lock; a'plurality of notched disk tumblers'co-axially mounted, abolt pivoted to'swing about'an axis adjacent'thetumblers, a pivoted; latch normally'h'olding the bolt in' lookbolt l isreturned to its normal 7 ing position, apivoted'pawl'formed'toenter thenotches of the tumblers when they are aligned in release position, saidpawl having an arm engageable with the latch to release said latch whensaid pawl enters the notches, one of the tumblers having an abutmentshoulder, and a yielding member carried by the bolt in position toengage said abutment as the bolt moves to unlocking position and servingto rotate the tumbler out of aligned position.

2. In a permutation look, a plurality of notched disk tumblersco-axially mounted, a bolt pivoted to swing about an axis adjacent thetumblers, a pivoted latch normally holding the bolt in locking position,a spring-pressed pawl formed to enter the notches of the tumblers whenthey are aligned in release position, said pawl having an arm engageablewith the latch to release said latch when said pawl enters the notches,and a yielding member operable by the bolt in its movement to unlockingposition and including means engageable with a tumbler while its notchis engaged with said pawl whereby the yielding member is stressed byfurther movement of the .bolt for rotating the tumbler out of alignedposition.

3. In a permutation look, a plurality of notched disk tumblersco-axially mounted, a bolt pivoted to swing about an axis adjacent thetumblers, a pivoted latch normally holding the bolt in looking position,a pivoted pawl formed to enter the notches of the tumblers when they arealigned in release position, said pawl having an arm engageable with thelatch to release said latch when 3 said pawl enters the notches, one ofthe tumblers having an abutment shoulder, and a curved spring am havingone end secured rigidly to said bolt with its free end positioned toengage the abutment shoulder during movement of the bolt for rotatingthe tumbler out of aligned position.

4. In a permutation lock, a plurality of notched disk tumblersco-axially mounted, a bolt pivoted to swing about an axis adjacent thetumblers, a pivoted latch normally holding the bolt in locking position,a pivoted pawl formed to enter the notches of the tumblers when they arealigned in release position, said pawl having an arm engageable with thelatch to release said latch when said pawl enters the notches, one ofthe tumblers having an additional notch in its curved arm of fiat springstock having one end rigidly secured to the bolt with the other endprojecting toward said tumbler notch in position to engage therein asthe bolt moves to unlocking position, the notch of said tumbler which isentered by the pawl being formed with one edge curved to act as a camoperable to force the pawl out of the aligned tumbler notches when saidtumbler is rotated, and the movement of the bolt being transmittedyieldingly to the tumbler for such rotation by the curved spring armwhereby alignment of the disk notches is disturbed in the unlockingmovement of the bolt.

WILLIAM E. HAMILTON.

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